They're not instant push notifications, as you might expect, they'll just pop up when it regularly checks, so they could be as much as 30m later, and won't pop up if you've already been into the app and read them.

Actually, strangely enough there's been a couple of times where the notification shows up even though I've already read the mention in Twitter. Anyway, the idea of push notifications is supposed to be that they're instant and don't require polling... kind of like push email. So I don't really know what to call these notifications

My Twitter app was working normally after PR1.2 update, just had to enter my password anew to grant access to Nokia N9 client. But Twitter notifications are not working. Yesterday I deleted Twitter account and then created it again - still no go.
Do not want to clear device for such a small glitch though.

@RazorNoobish
I have Twitter normally working, only notifications on LPM, lock screen and event feed not showing.
Actually today it was resolved - I had an mention notification on my device
Only deleting/recreating account worked for me.

I keep having this issue as well, but for me the Facebook part is working and Twitter isn't.
I already did a complete reinstall of the firmware, so that's not helping. Also removed my Twitter account and added it again. Didn't helpe either.

Even stranger, the Twitter notification does work in one situation: after a reboot. And then only once.

I've never got twitter notification as of yet. It just gets updated in Notification window every refresh. Facebook notification only comes through to N9 if I manually refresh Feeds in the Notification window making this whole push notification useless...

__________________Nokia N9 bugs reported. Please vote:

Youtube videos shared on the sites to be shown in stock browser & played using built-in Youtube player - Vote here

Sliding to answer/reject calls while in locked state lags painfully - Vote here

Availability & Transfers window always open from the bottom of the window despite whichever direction you put them away - Vote here